CN114274048A - Porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting - Google Patents
Porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting Download PDFInfo
- Publication number
- CN114274048A CN114274048A CN202111444390.8A CN202111444390A CN114274048A CN 114274048 A CN114274048 A CN 114274048A CN 202111444390 A CN202111444390 A CN 202111444390A CN 114274048 A CN114274048 A CN 114274048A
- Authority
- CN
- China
- Prior art keywords
- liquid
- grinding wheel
- ethyl alcohol
- particle
- gallium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 209
- 238000000227 grinding Methods 0.000 title claims abstract description 194
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 229910052733 gallium Inorganic materials 0.000 title claims abstract description 96
- 238000005422 blasting Methods 0.000 title claims abstract description 26
- 239000000919 ceramic Substances 0.000 title claims abstract description 23
- 238000007710 freezing Methods 0.000 title claims abstract description 23
- 230000008014 freezing Effects 0.000 title claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 96
- 239000002245 particle Substances 0.000 claims abstract description 96
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000011859 microparticle Substances 0.000 claims abstract description 61
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 48
- 239000000428 dust Substances 0.000 claims abstract description 41
- 229920001661 Chitosan Polymers 0.000 claims abstract description 15
- 230000009471 action Effects 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims description 56
- 230000003068 static effect Effects 0.000 claims description 43
- 239000000463 material Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 23
- 230000001502 supplementing effect Effects 0.000 claims description 21
- 239000002923 metal particle Substances 0.000 claims description 14
- 230000008602 contraction Effects 0.000 claims description 10
- 235000019441 ethanol Nutrition 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000011164 primary particle Substances 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 16
- 239000011259 mixed solution Substances 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 239000012530 fluid Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 238000003754 machining Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 239000007767 bonding agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910001651 emery Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000006061 abrasive grain Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010892 electric spark Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Landscapes
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
The invention provides a porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting, which is used for solving the problems that when a large-granularity porous ceramic grinding wheel is fed slowly for large-cutting-depth grinding, molten-state grinding dust is solidified and completely blocks the grinding wheel, so that the grinding precision is reduced sharply and the grinding temperature is increased sharply. Firstly, liquid gallium microparticles dispersed by chitosan and absolute ethyl alcohol are mixed in two stages, then the mixed solution flows to the surface of a grinding wheel through a central rotary joint and an inner flow channel, the liquid gallium microparticles fill gaps between abrasive particles and bottom-most abrasive dust, then the liquid gallium microparticles are frozen to minus sixty ℃ by low-temperature nitrogen, the liquid gallium microparticles are frozen and micro-exploded to generate shock waves and quasi-static pressure to prop or break the abrasive dust from the surface of the abrasive particles, and finally the liquid gallium microparticles and the abrasive dust are separated from the grinding wheel under the centrifugal action.
Description
Technical Field
The invention relates to the technical field of grinding wheel dressing in grinding processing, in particular to a porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting.
Background
Compared with other machining methods, the grinding machining has the advantages of high machining precision, good surface quality, wide machining range and the like, and therefore, the grinding machining method is widely applied to fine machining of parts. Compared with other cutting processes, the grinding process has the advantages of large unit grinding force and high grinding speed. In grinding operations, the size, shape and distribution of the abrasive particles play an important role in the process. In particular, aerospace ductile metal materials such as nickel-based alloys have high hardness and poor thermal conductivity, and when the hard materials are processed, abrasive dust can be quickly adhered to the surfaces or air holes of abrasive particles. The rapid passivation phenomenon of the grinding wheel blockage is easily caused, and the service life of the grinding wheel is forced to be ended too early. Therefore, the method has important significance for timely removing the blockage of the grinding wheel in the grinding process. In the grinding process, the abrasive particles on the working surface of the grinding wheel can be gradually dull ground, the grinding force is increased, the grinding temperature is increased, and flutter and burn occur, so that the surface integrity of the processed part is greatly influenced. Meanwhile, the grinding dulling of the grinding wheel can also make the working surface lose the correct geometric shape, so that the processing precision is reduced. Dressing of the wheel includes dressing and dressing, the purpose of which is to maintain the correct geometry and sharpness of the wheel. The porous ceramic bond grinding wheel is easier to trim, and the shaping and the dressing can be carried out simultaneously.
The deep-cutting slow-feed grinding generally means that the grinding depth is larger, and the process is characterized by low feed speed which is about 0.001-0.01 times of that of common grinding, for example, the workpiece speed can be as low as 0.2mm/s in plane grinding. On the other hand, the cutting depth is about 100 to 1000 times of that of the ordinary grinding, for example, the limit cutting depth can reach 20 to 30mm in the case of plane grinding. The efficiency of the slow feeding grinding is generally 3-5 times higher than that of the common grinding, the surface roughness Ra is less than or equal to 0.2-0.4 mu m, and the precision of the molded surface is less than or equal to 2-5 mu m, so that the method is an efficient and precise machining method. The advantages of deep plunge grinding are shorter grinding time, higher surface quality and dimensional accuracy and better curved surface profile. However, the large grinding depth and the long contact length of the grinding wheel workpiece in the deep plunge grinding cause a large grinding force to be generated during grinding and a large amount of heat to be generated in the grinding region. Due to the lower feed rate of the workpiece, the heat generated is more likely to collect in the grinding zone and be difficult to dissipate, which results in a rapid increase in the temperature of the grinding wheel and workpiece. In particular, grinding of difficult-to-machine materials results in very high surface temperatures of the workpiece.
The types of the grinding wheel blockage are various, and the blockage states generated by different workpiece materials and processing working conditions are different. The general types are embedded, attached and adhesive. The embedded type blockage is that the abrasive dust is embedded in the air holes on the working surface of the grinding wheel; the attachment type blockage is that abrasive particles are attached to the periphery of a cutting edge of the abrasive particles or a binder by temporary force and heat; the sticking type blockage is that in the grinding process, the temperature of a grinding point reaches over 1200K, a plurality of abrasive dust adheres to the periphery of abrasive particles, the blockage is intensified when the grinding force is increased and the temperature is increased until the abrasive particles are broken or fall off, and the sticking type blockage is melting bonding. The plug-in type and the plug-in type belong to the plug phenomenon generated by mechanically filling in the gap of the grinding wheel, and the filling power comes from two aspects, namely external and internal, and relates to various factors such as physics, electricity, heat and the like.
The sharpening is to remove the bonding agent among the abrasive grains, so that a certain chip containing space is formed among the abrasive grains, and the grinding edge protrudes out of the bonding agent to form a cutting edge. The dressing of the super-abrasive grinding wheel meets the following requirements: 1. removing the binder material on the surface of the grinding wheel, so that the abrasive particles protrude out of the surface of the grinding wheel to form a cutting edge; 2. forming chip containing spaces among the abrasive particles on the surface of the grinding wheel; 3. the bonding depth of the abrasive particles in the bonding agent meets the requirement, so that the abrasive particles have firm holding force during cutting and do not fall off.
The liquid gallium microparticles dispersed by chitosan have high thermal conductivity, 15.53 times that of deionized water. The gallium particle material with the diameter of 100 microns can excite the violent deformation of the material when undergoing the phase change behavior of being frozen from a liquid state to a solid state, the volume of the gallium particle material is increased by about 6.5%, the hardness of the gallium particle material is 1.5-2.5, a sharp point can be rapidly generated in a certain direction, and 150 microns of abrasive dust can be penetrated in 1 ms.
The invention patent with the publication number of CN105108651A and the invention name of the grinding wheel blockage detecting and cleaning device and method integrating the acoustic emission and the dynamometer discloses a grinding wheel blockage detecting and cleaning device and method integrating the acoustic emission and the dynamometer, which remove the static electricity of a blockage according to the point discharge principle, and spray a high-pressure gas-liquid mixture from a static neutralizing nozzle to eliminate the mechanical adhesion force of the blockage on a grinding wheel without damaging normal abrasive particles. However, the technical scheme still has the following problems: in actual emery wheel dressing, strike the emery wheel with high-pressure gas-liquid mixture and can only clear away the abrasive dust on emery wheel top layer and can impel some abrasive dusts into the deeper of grit gap and gas pocket, can increase the emery wheel dressing degree of difficulty on the contrary. When the electric spark shaping is adopted, the principle of electric spark shaping shows that in order to generate electric sparks between the grinding wheel and the electrode and effectively remove the metal bonding agent, a certain discharge gap is required to be kept between the tool electrode and the machined surface of the grinding wheel, and the gap is determined according to machining conditions and is usually several micrometers to dozens of micrometers. If the gap is too large, the interpolar voltage cannot break down the interpolar dielectric and thus spark discharge will not occur. If the diameter of the abrasive grain of the grinding wheel is larger, the distance between the metal bond on the surface of the grinding wheel and the tool electrode may exceed the critical gap of spark discharge. Therefore, spark truing is only available for truing fine grit grinding wheels.
Disclosure of Invention
Aiming at the problems, the invention provides a porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting, which is used for solving the problems that when a large-granularity porous ceramic grinding wheel is fed slowly for large-cutting-depth grinding, molten state grinding dust is solidified and then completely blocks the grinding wheel, so that the grinding precision is reduced sharply and the grinding temperature is increased sharply.
In order to achieve the purpose, the invention provides a porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting, which is characterized in that:
the method comprises the following steps: the device comprises a control system, a mixing module, a liquid supply module and a sharpening module;
the control system is used for controlling the mixing module, the liquid supply module and the sharpening module;
the mixing module includes: the device comprises a liquid gallium micron particle storage box, a secondary SL static mixer, a metal particle secondary feeding cylinder, a particle secondary feeder, a primary SL static mixer, a metal particle primary feeding cylinder, a particle primary feeder, an absolute ethyl alcohol primary feeding cylinder, an absolute ethyl alcohol primary feeder, an absolute ethyl alcohol storage box and a one-way pipeline;
the particle secondary feeder, the particle primary feeder and the absolute ethyl alcohol primary feeder are respectively provided with a liquid inlet and a liquid outlet;
the liquid inlets of the particle secondary material supplementing device, the particle primary material supplementing device and the absolute ethyl alcohol primary material supplementing device are respectively provided with a one-way valve, and the conduction direction of the one-way valves is the direction of entering the material supplementing devices;
the metal particle secondary feeding cylinder, the metal particle primary feeding cylinder and the primary feeding cylinder are respectively connected with the particle secondary material supplementing device, the particle primary material supplementing device and the absolute ethyl alcohol primary material supplementing device through connecting rods;
the liquid gallium micron particle storage box is respectively communicated with a liquid inlet of the particle secondary feeder and a liquid inlet of the particle primary feeder through one-way pipelines;
the absolute ethyl alcohol storage tank is communicated with a liquid inlet of the absolute ethyl alcohol primary feeder through a one-way pipeline;
the two-stage SL static mixer and the one-stage SL static mixer are both provided with two liquid inlets and one liquid outlet;
two liquid inlets of the primary SL static mixer are respectively communicated with the liquid outlets of the primary particle material supplementing device and the primary absolute ethyl alcohol material supplementing device through one-way pipelines;
the liquid outlet of the first-stage SL static mixer is communicated with a liquid inlet of the second-stage SL static mixer through a one-way pipeline;
the liquid outlet of the particle secondary feeder is communicated with a liquid inlet of a secondary SL static mixer through a one-way pipeline;
the liquid supply module comprises a rotary supply joint and a one-way pipeline;
the rotary feeding joint comprises a rotary feeding joint shell and a rotary feeding joint shaft body; the rotary feed joint shell comprises a rotary feed joint shell inlet, an annular liquid tank and a separation tank;
the separation grooves are used for separating the annular liquid tanks to ensure that the annular liquid tanks are independent and do not interfere with each other;
the inlet of the shell of the rotary feed joint is correspondingly communicated with the annular liquid tank;
the inlet of the shell of the rotary feed joint is communicated with the liquid outlet of the secondary SL static mixer through a one-way pipeline;
the rotary feed joint shaft body comprises a rotary feed joint shaft body outlet;
the shaft body inlet of the rotary feeding joint is correspondingly communicated with the annular liquid tank;
the rotary feed joint shaft body is connected with the grinding wheel through a screw;
the shaft body outlet of the rotary feeding joint is directly communicated with the liquid storage cavity of the inner flow passage;
the sharpening module is used for providing a cold source to freeze the gallium microparticles to generate micro-blasting;
the sharpening module comprises a nitrogen pipe and a nitrogen sprayer;
one end of the nitrogen pipe is provided with a nitrogen storage device, and the other end of the nitrogen pipe is provided with a nitrogen nozzle;
the nitrogen nozzle comprises a contraction accelerating cavity, an auxiliary nozzle and a main nozzle;
the nitrogen pipe is directly connected with the contraction accelerating cavity;
the auxiliary nozzle is positioned on the side wall of the contraction acceleration cavity, and the opening direction is opposite to the rotation direction of the grinding wheel;
the main nozzle is positioned at the outlet of the contraction accelerating cavity.
Furthermore, the grinding wheel comprises a grinding wheel grinding layer, a grinding wheel base body, an inner runner liquid storage cavity channel and a grinding wheel mounting hole;
the inner runner is arranged in the grinding wheel base body, an inlet end is provided with an inner runner liquid storage cavity, and an outlet is positioned at the bottom of the grinding layer of the grinding wheel;
the inner flow passages are uniformly distributed around the grinding wheel mounting hole and are uniformly divided into a plurality of groups, and the grouping number is the same as the number of the rotary feed joint shaft body outlets;
the inner runner liquid storage cavity channel is used for connecting the same group of inner runner liquid storage cavities to ensure the supply of mixed liquid.
Furthermore, the grinding wheel is a ceramic bond grinding wheel with porosity higher than 60% and small pore diameter; the liquid gallium microparticles are chitosan dispersed liquid gallium microparticles; the absolute ethyl alcohol has a concentration higher than 99.5%Ethanol solution。
Furthermore, the rotary feed connector shaft body of the rotary liquid supply connector and the corresponding flow channel on the rotary feed connector shell are connected through mutually independent annular liquid grooves, so that the corresponding flow channels can be communicated when the shaft and the rotary feed connector shell rotate mutually, and different flow channels can be mutually independent without interference.
Furthermore, the nitrogen nozzle is provided with an auxiliary nozzle at the front end of the main nozzle to destroy a gas barrier layer around the grinding wheel, so that low-temperature nitrogen sprayed by the main nozzle can directly contact with the grinding layer.
Furthermore, the nitrogen nozzle is of a Laval nozzle structure, the front half part of the nozzle is contracted from big to small to the middle to a narrow throat, and the narrow throat is expanded from small to big outwards.
Furthermore, the flow path curve of the flow channel in the grinding wheel is determined by dividing a plurality of circles between two circles with different diameters, connecting each intersection point by adopting a smooth curve with the intersection point of the tangent line of each circle and the next circle as a base point, and obtaining the curve which is the flow path curve of the flow channel in the grinding wheel.
Further, the cross-sectional area of the inner runner of the grinding wheel is gradually reduced along the flowing direction of the mixed liquid, and the cross-sectional area at the inlet of the inner runner is not less than two times of the cross-sectional area at the outlet of the inner runner;
furthermore, the one-way pipeline is provided with a one-way valve at each node, and the conduction direction is one-way conduction from the liquid gallium micron particle storage tank and the absolute ethyl alcohol storage tank to the rotary liquid supply connector.
The embodiment also provides a dressing method of the porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting, which is characterized by comprising the following steps:
step 1, a metal particle primary feeding cylinder drives a particle primary feeder to suck liquid gallium microparticles dispersed by chitosan in a liquid gallium microparticle storage box into the particle primary feeder through a one-way pipeline; simultaneously, the absolute ethyl alcohol primary feeding cylinder drives the absolute ethyl alcohol primary material supplementing device to suck the absolute ethyl alcohol in the absolute ethyl alcohol storage box into the absolute ethyl alcohol primary material supplementing device through a one-way pipeline, and primary mixing is prepared;
step 4, driving a liquid gallium microparticle secondary feeding cylinder to drive a liquid gallium microparticle secondary material supplementing device to push liquid gallium microparticles into a secondary SL static mixer to be secondarily mixed with liquid gallium microparticle absolute ethyl alcohol mixed liquid in the primary SL static mixer;
and 8, separating the solid liquid gallium microparticles and the abrasive dust from the grinding layer of the grinding wheel under the centrifugal action.
The invention has the following beneficial effects:
1. the method of the invention uses low-temperature nitrogen to freeze the liquid gallium microparticles and simultaneously has the function of cooling the whole grinding wheel, reduces the waste of a large amount of grinding fluid, and meets the energy-saving and environment-friendly requirements advocated in the industrial field.
2. The chitosan dispersed liquid gallium micron particles used in the method have high thermal conductivity which is 15.53 times that of deionized water, and the freezing speed is high.
3. The chitosan-dispersed gallium microparticles used in the method can completely fill gaps among the abrasive particles, the bonding agent and the deepest layer abrasive dust by diffusing in the grinding layer through pores of the grinding wheel, and the liquid gallium microparticles are frozen and micro-exploded to generate shock waves and quasi-static pressure to prop or break the abrasive dust from the surface of the abrasive particles.
4. The shaft of the rotary liquid supply joint and the corresponding flow channels on the rotary material supply joint shell are connected through the independent annular liquid grooves, so that the corresponding flow channels can be communicated when the shaft and the rotary material supply joint shell rotate mutually, and different flow channels can be independent without interference.
5. The curve shape of the inner runner of the grinding wheel used in the method ensures that when the mixed liquid flows in the inner runner, the included angle between the cutting direction of the grinding wheel and the flowing-out direction of the cooling liquid is always kept unchanged at any point, so that the impact on the runner and the grinding wheel is minimum.
6. The surface of the grinding wheel treated by the method is not deformed, and the defects such as corrosion, cracks and the like on the surface of the grinding wheel can not change the structure and the use of the grinding wheel.
7. The method has the advantages of sufficient low-temperature nitrogen raw materials, low price, capability of recycling nitrogen, cooling and cyclic utilization and no environmental pollution.
8. The chitosan dispersed liquid gallium microparticles used in the method can be recycled and reused after being recycled and separated.
Drawings
FIG. 1 is a schematic view of a wheel sharpening apparatus based on the micro-blasting effect of freezing liquid metal;
FIG. 2 is a schematic diagram of an SL static mixer;
FIG. 3 is a schematic diagram of the structure of an X-shaped mixing unit of the SL static mixer;
FIG. 4 is a schematic diagram of a cryogenic freeze micro-blasting of gallium microparticles;
FIG. 5 is a schematic view of the discharge port of the rotary feed connection;
FIG. 6 is a schematic view of the feed inlet of the rotary feed connection;
FIG. 7 is a schematic view of an internal flow passage layout;
FIG. 8 is a schematic view of a single internal flow passage shape;
FIG. 9 is a schematic view of a nitrogen showerhead construction;
wherein: 1-liquid gallium micron particle storage box, 2-second-stage SL static mixer, 3-metal particle second-stage feeding cylinder, 4-particle second-stage feeder, 5-first-stage SL static mixer, 6-metal particle first-stage feeding cylinder, 7-particle first-stage feeder, 8-absolute ethyl alcohol, 9-absolute ethyl alcohol first-stage feeding cylinder, 10-absolute ethyl alcohol first-stage feeder, 11-base, 12-spindle box, 13-nitrogen nozzle, 14-grinding wheel, 15-rotary feeding joint, 16-control center, 17-absolute ethyl alcohol storage box, 18-one-way pipeline, 19-chitosan dispersed liquid gallium micron particle, 20-SL static mixer mixing unit side plate, 21-SL static mixer mixing unit center plate, 22-abrasive particles, 23-abrasive dust, 24-mixed liquid, 25-rotary feed joint shaft body outlet, 26-rotary feed joint shaft body flow passage, 27-rotary feed joint shaft body inlet, 28-rotary feed joint shaft body, 29-rotary feed joint shell body inlet, 30-annular liquid groove, 31-rotary feed joint shell body, 32-separation groove, 33-grinding wheel grinding layer, 34-grinding wheel base body, 35-inner flow passage, 36-inner flow passage liquid storage cavity, 37-inner flow passage liquid storage cavity channel, 38-grinding wheel mounting hole, 39-nitrogen pipe, 40-contraction acceleration cavity, 41-auxiliary nozzle and 42-main nozzle.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be described below clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 9, this embodiment provides a grinding wheel dressing device based on a liquid metal freezing micro-blasting effect, which substantially freezes liquid gallium microparticles dispersed by chitosan to minus sixty degrees centigrade to form solid particles by using low-temperature nitrogen, and the gallium microparticles are severely deformed during phase transition to prop open or break up the grinding chips blocked in the pores and gaps of the grinding wheels.
The grinding wheel dressing device comprises a control system, a mixing module, a liquid supply module and a dressing module.
The mixing module includes: the device comprises a liquid gallium micron particle storage box 1, a secondary SL static mixer 2, a metal particle secondary feeding cylinder 3, a particle secondary feeder 4, a primary SL static mixer 5, a metal particle primary feeding cylinder 6, a particle primary feeder 7, absolute ethyl alcohol 8, an absolute ethyl alcohol primary feeding cylinder 9, an absolute ethyl alcohol primary feeder 10, an absolute ethyl alcohol storage box 17 and a one-way pipeline 18; the liquid supply module includes: a rotary feed connector 15, a one-way pipeline 18, an inner flow passage 35, an inner flow passage liquid storage cavity 36 and an inner flow passage liquid storage cavity channel 37; the sharpening module includes: nitrogen pipe 39, nitrogen nozzle 13.
As shown in fig. 1, a one-way pipeline in the mixing module is sequentially connected with a liquid gallium microparticle storage tank 1, a second-stage SL static mixer 2, a microparticle second-stage feeder 4, a first-stage SL static mixer 5, a microparticle first-stage feeder 7, an absolute ethanol first-stage feeder 10 and an absolute ethanol storage tank 17, in order to prevent backflow of the mixed liquid due to excessive pressure, a one-way valve is arranged between the liquid gallium microparticle storage tank 1 and the microparticle first-stage feeder 7, between the liquid gallium microparticle storage tank 1 and the microparticle second-stage feeder 4, between the absolute ethanol storage tank 17 and the absolute ethanol first-stage feeder 10, between the first-stage SL static mixer 5 and the microparticle first-stage feeder 7 and between the absolute ethanol first-stage feeder 10.
As shown in FIG. 3, the SL static mixer in the mixing module mixes the fluids over a wide range without mechanical rotation by means of different configurations of the fluid lines, and by cutting, shearing, spinning and remixing two or more streams of fluid through the SL static mixer mixing unit side plates 20 and the SL static mixer mixing unit center plate 21 fixed in the tube, chitosan dispersed liquid gallium microparticles 19 are thoroughly mixed in anhydrous ethanol 8. The mixer is operated to allow the chitosan dispersed liquid gallium microparticles 19 and absolute ethanol 8 to flow in the pipeline and impact the plate member, increasing the velocity gradient of the laminar flow motion or creating turbulence. Laminar flow is divided, moved at a position and recombined, and turbulent flow generates violent vortex in the cross section direction besides the three conditions, and strong shearing force acts on the fluid to further disperse and mix the fluid, and finally the fluid is mixed to form the required mixed liquid.
As shown in FIG. 4, the chitosan dispersed liquid gallium microparticles with a diameter of 100 μm were micro-exploded by rapid freezing with low-temperature nitrogen gas, and the volume thereof increased by about 6.5% within 1ms and pointed spines with a length of 150 μm were generated. In a short time, the energy is converted from one form to another or several forms with strong mechanical effects. In the process, the micro-blasting mainly forms two loads acting on the surrounding medium: shock waves and quasi-static pressure. The explosive energy is large, and the propagation of the pressure jump causes the state parameters of the surrounding medium, such as density, pressure temperature, speed, and the like to change rapidly, so that a steep wave front is generated, a non-periodic pulse is formed, and the explosive wave is propagated at supersonic speed to form a shock wave. As the shock wave propagates forward, a stress wave is formed as the distance and time increase gradually decays. The stress wave is gradually gentle compared with the shock wave, and the time for the stress rising stage is shorter than that for the stress falling stage. The state parameter of the abrasive dust on the wave front is relatively reduced compared with the shock wave, but the abrasive dust can still be deformed and damaged. According to the huygens principle, the morphological characteristics of a wave do not change when the wave propagates in a homogeneous medium. As the absolute ethyl alcohol between the abrasive particles and the bottom-most abrasive dust is also a uniform medium, the shock wave form characteristics of the shock wave generated by freezing and micro-blasting of the chitosan-dispersed liquid gallium microparticles are not obviously changed in the process of transmitting the shock wave to the tip of the joint gap between the abrasive particles and the abrasive dust from the absolute ethyl alcohol medium. When the shock wave reaches the tip of the joint gap between the abrasive particles and the abrasive dust is incident from the tip, the refraction angle of the impact wave incident on the abrasive dust is changed due to the difference of the wave velocity between the abrasive dust and the absolute ethyl alcohol medium. The change of the refraction angle of the incident sub stress wave can cause the change of the tip angle of the superimposed stress wave, thereby changing the stress magnitude of the superimposed stress wave. As the micro-explosion stress wave is transmitted to the tip of the joint gap between the abrasive particles and the abrasive dust from the absolute ethyl alcohol medium in the space between the abrasive particles and the abrasive dust, the magnitude of the stress wave is not attenuated too much, only the denudation damage is formed on the surface of the abrasive dust in the transmission process, and the macro-fracture crack is not generated in the non-tip direction. When the impact wave reaches the tip inclined plane and enters abrasive dust, the sub-stress wave has larger energy, the crack starts to directionally initiate and expand from the cross-over gap due to the stress concentration superposed on the cross-over gap, a plurality of V-shaped stress waves are formed to propagate forwards, and the superposed V-shaped stress waves form a stress concentration area with obvious directional directivity in the direction of the cross-over gap. When the shock wave reaches the tip of a joint gap between abrasive particles and abrasive dust, due to the V-shaped structure of the tip, the stress wave of the incident abrasive dust is separated into two independent waves which are symmetrical by the horizontal central line of a slot, the two waves are intersected at the tip of the joint gap between the abrasive particles and the abrasive dust, the tension behind the wave front is transmitted in different directions, a tensile stress concentration area in the normal direction is formed on the extension line of the tip, the superposed shock wave is transmitted forwards along the extension line of the tip of the slot, and when the stress of the superposed shock wave is greater than the tensile strength of the abrasive dust, the abrasive dust is cracked from the extension line of the tip; when the propagation attenuation of the superimposed shock wave is realized, the stress is smaller than the tensile strength of the abrasive dust, but is larger than the damage strength of the abrasive dust, a damage zone is formed in the extension direction of the tip of the abrasive dust, the crack is guided to be directionally expanded under the action of quasi-static pressure to cause the initial crack initiation, and the quasi-static pressure pushes the subsequent crack expansion.
As shown in fig. 5 and 6, the rotary feed joint 15 of the liquid supply module is composed of a rotary feed joint shaft body 28 and a rotary feed joint shell 31. Wherein the swivel feed joint shaft 28 is divided into a swivel feed joint shaft outlet 25, a swivel feed joint shaft flow channel 26 and a swivel feed joint shaft inlet 27, and the swivel feed joint housing 31 is divided into a swivel feed joint housing inlet 29, an annular liquid bath 30 and a separation bath 32. The corresponding flow channels on the rotary feed joint shaft body 28 and the rotary feed joint housing 31 are connected by mutually independent annular liquid tanks, so that the corresponding flow channels can be communicated when the shaft and the rotary feed joint housing mutually rotate, and different flow channels can be mutually independent without interference. The secondary mixed liquid passes through the one-way pipeline and sequentially passes through the rotary feeding connector shell inlet 29, the annular liquid tank 30, the rotary feeding connector shaft body inlet 27, the rotary feeding connector shaft body flow passage 26 and the rotary feeding connector shaft body outlet 25 to enter the inner flow passage liquid storage cavity 36.
As shown in FIG. 7, the grinding wheel base 34 of the liquid supply module is provided with an inner flow passage 35, an inner flow passage liquid storage cavity 36 and an inner flow passage liquid storage cavity channel 37. The curve shape determining process of the inner flow passage is that a plurality of circles are divided between two concentric circles with different diameters, the intersection point of the tangent line of each circle and the next circle is used as a base point, the points are connected by a smooth curve, and the formed curve is the curve of the grinding wheel inner flow passage; the curve shape of the inner flow channel enables the included angle between the cutting direction of the grinding wheel and the outflow direction of the mixed liquid to be kept unchanged all the time at any point when the mixed liquid flows in the inner flow channel, and the impact on the flow channel and the grinding wheel is minimum.
As shown in fig. 8, the cross-sectional area of the grinding wheel inner flow passage 35 is gradually reduced in the mixed liquid flowing direction, and the cross-sectional area at the inlet of the inner flow passage is larger than twice the cross-sectional area at the outlet of the inner flow passage. When the mixed liquid flows through the grinding wheel inner flow passage, the flow velocity of the mixed liquid is high due to the centrifugal force generated by the high-speed rotation of the grinding wheel, and the pressure of the mixed liquid on the grinding wheel base body 33 is gradually increased along with the gradual reduction of the cross-sectional area of the grinding wheel inner flow passage.
As shown in FIG. 9, the tail end of the nitrogen gas pipe 39 in the sharpening module is provided with two nozzles, namely a contraction accelerating cavity 40, an auxiliary nozzle 41 and a main nozzle 42. Four air flows exist around the grinding wheel rotating at high speed: internal air flow, circumferential circulation, saturation air flow, and radial air flow, which are caused by the viscosity of the grinding wheel surface with air and air micro-cluster effects. The gas flow influencing the contact of the low-temperature nitrogen with the surface of the grinding wheel mainly has two types: firstly, the revolving air flow generated by the grinding wheel rotating at high speed; and secondly, air on the surface of the grinding wheel enters from the side surface of the grinding wheel under the action of centrifugal force and is sprayed out from the outer circular surface, and the air enters from the side surface of the grinding wheel and forms a high-pressure air flow barrier, so that the effective injection of low-temperature nitrogen is hindered. The requirements for the low temperature nitrogen to be able to overcome the gas flow barrier into the grinding zone are: the dynamic pressure of the low temperature nitrogen is greater than the dynamic pressure of the grinding zone gas flow barrier, which can be achieved by increasing the supply gas pressure or weakening the gas flow barrier. The movement of the low-temperature nitrogen in the contraction acceleration cavity 40 follows the principle that the flow velocity is high at the small part of the cross section and is low at the large part of the cross section when the fluid moves in the pipe, so that the gas flow is accelerated continuously. The auxiliary nozzle 41 is arranged at the front end of the main nozzle 42, a certain included angle is formed between the auxiliary nozzle 41 and the main nozzle 42, the size of the nozzle of the auxiliary nozzle 41 is gradually reduced from inside to outside, low-temperature nitrogen can be further accelerated during air injection, high-pressure nitrogen with a certain angle is injected and is firstly injected to the surface of the grinding wheel, an air barrier layer around the grinding wheel is damaged, an instantaneous vacuum or low-pressure area is formed near the grinding area, and therefore the low-temperature nitrogen injected by the main nozzle can directly contact the grinding layer. The size of the nozzle of the main nozzle 42 is gradually enlarged from inside to outside, and the coverage area of high-pressure nitrogen is increased.
The embodiment also provides a porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting, which comprises the following specific steps:
step 1, the particle feeding cylinder drives the particle primary feeder to suck the liquid gallium microparticles in the liquid gallium microparticle storage box into the particle primary feeder through a one-way pipeline. Simultaneously, the feeding cylinder drives the ethanol feeder to suck the absolute ethanol in the absolute ethanol storage box into the ethanol feeder through a one-way pipeline for preparing primary mixing;
step 4, the feeding cylinder drives the particle secondary feeder to push the liquid gallium microparticles in the particle secondary feeder into a secondary SL static mixer to be secondarily mixed with the liquid absolute ethanol mixture of the liquid gallium microparticles in the primary SL static mixer;
and 8, separating the solid liquid gallium microparticles and the abrasive dust from the grinding layer of the grinding wheel under the centrifugal action.
Although specific embodiments of the present invention have been disclosed in detail with reference to the accompanying drawings, it is to be understood that such description is merely illustrative of and not restrictive on the broad invention. The scope of the present invention is defined by the appended claims, and may include various modifications, alterations, and equivalents made thereto without departing from the scope and spirit of the invention.
Claims (10)
1. Porous ceramic grinding wheel dressing device based on liquid gallium freezes micro-blasting, its characterized in that:
the method comprises the following steps: the device comprises a control system, a mixing module, a liquid supply module and a sharpening module;
the control system is used for controlling the mixing module, the liquid supply module and the sharpening module;
the mixing module includes: the device comprises a liquid gallium micron particle storage box (1), a secondary SL static mixer (2), a metal particle secondary feeding cylinder (3), a particle secondary feeder (4), a primary SL static mixer (5), a metal particle primary feeding cylinder (6), a particle primary feeder (7), an absolute ethyl alcohol primary feeding cylinder (9), an absolute ethyl alcohol primary feeder (10), an absolute ethyl alcohol storage box (17) and a one-way pipeline (18);
the particle secondary feeder (4), the particle primary feeder (7) and the absolute ethyl alcohol primary feeder (10) are respectively provided with a liquid inlet and a liquid outlet;
the liquid inlets of the particle secondary feeder (4), the particle primary feeder (7) and the absolute ethyl alcohol primary feeder (10) are respectively provided with a one-way valve, and the conduction direction of the one-way valves is the direction of entering the feeders;
the metal particle secondary feeding cylinder (3), the metal particle primary feeding cylinder (6) and the primary feeding cylinder (9) are respectively connected with the particle secondary feeder (4), the particle primary feeder (7) and the absolute ethyl alcohol primary feeder (10) through connecting rods;
the liquid gallium micron particle storage box (1) is respectively communicated with a liquid inlet of the particle secondary feeder (4) and a liquid inlet of the particle primary feeder (7) through a one-way pipeline (18);
the absolute ethyl alcohol storage tank (17) is communicated with a liquid inlet of the absolute ethyl alcohol primary feeder (10) through a one-way pipeline (18);
the two-stage SL static mixer (2) and the one-stage SL static mixer (5) are respectively provided with two liquid inlets and one liquid outlet;
two liquid inlets of the primary SL static mixer (5) are respectively communicated with the liquid outlets of the primary particle feeder (7) and the primary absolute ethyl alcohol feeder (10) through a one-way pipeline (18);
the liquid outlet of the first-stage SL static mixer (5) is communicated with a liquid inlet of the second-stage SL static mixer (2) through a one-way pipeline (18);
the liquid outlet of the particle secondary feeder (4) is communicated with a liquid inlet of the secondary SL static mixer (2) through a one-way pipeline (18);
the liquid supply module comprises a rotary feed connector (15) and a one-way pipeline (18);
the rotary feed joint (15) comprises a rotary feed joint shell (31) and a rotary feed joint shaft body (28); the rotary feed joint housing (31) comprises a rotary feed joint housing inlet (29), an annular liquid channel (30) and a separation channel (32);
the separation groove (32) is used for separating each annular liquid groove to ensure that the annular liquid grooves are independent and do not interfere with each other;
the inlet (29) of the shell of the rotary feed joint is correspondingly communicated with the annular liquid tank (30);
the inlet (29) of the shell of the rotary feed joint is communicated with the liquid outlet of the secondary SL static mixer (2) through a one-way pipeline (18);
the rotary feed joint shaft body (28) comprises a rotary feed joint shaft body outlet (25), a rotary feed joint shaft body flow passage (26) and a rotary feed joint shaft body inlet (27);
the rotary feed joint shaft body inlet (27) is correspondingly communicated with the annular liquid tank (30);
the rotary feed joint shaft body (28) is connected with the grinding wheel (14) through a screw;
the rotary feed joint shaft body outlet (25) is directly communicated with the inner runner liquid storage cavity (36);
the sharpening module is used for providing a cold source to freeze the gallium microparticles to generate micro-blasting;
the sharpening module comprises a nitrogen pipe (39) and a nitrogen sprayer (13);
one end of the nitrogen pipe (39) is provided with a nitrogen storage device, and the other end is provided with a nitrogen nozzle (13);
the nitrogen nozzle (13) comprises a contraction accelerating cavity (40), an auxiliary nozzle (41) and a main nozzle (42);
the nitrogen pipe (39) is directly connected with the contraction accelerating cavity (40);
the auxiliary nozzle (41) is positioned on the side wall of the contraction accelerating cavity (40), and the opening direction is opposite to the rotation direction of the grinding wheel (14);
the main nozzle (42) is positioned at the outlet position of the contraction acceleration cavity (40).
2. The porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting according to claim 1, characterized in that: the grinding wheel (14) comprises a grinding wheel grinding layer (33), a grinding wheel base body (34), an inner runner (35), an inner runner liquid storage cavity (36), an inner runner liquid storage cavity channel (37) and a grinding wheel mounting hole (38);
the inner runner (35) is arranged in the grinding wheel base body (34), an inlet end is provided with an inner runner liquid storage cavity (36), and an outlet is positioned at the bottom of the grinding wheel grinding layer (33);
the inner flow passages (35) are uniformly distributed around the grinding wheel mounting hole (38) and are uniformly divided into a plurality of groups, and the grouping number is the same as that of the rotary feed joint shaft body outlets (25);
the inner runner liquid storage cavity channel (37) is used for connecting the same group of inner runner liquid storage cavities (36) to ensure the supply of the mixed liquid (24).
3. The porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting according to claim 1, characterized in that: the grinding wheel (14) is a ceramic bond grinding wheel with porosity higher than 60% and small pore diameter; the liquid gallium microparticles (22) are chitosan dispersed liquid gallium microparticles; the absolute ethyl alcohol is an ethyl alcohol solution with the concentration higher than 99.5 percent.
4. The porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting according to claim 1, characterized in that: the rotary feed joint shaft body of the rotary liquid supply joint (15) is connected with the corresponding flow channel on the rotary feed joint shell through mutually independent annular liquid grooves, so that the corresponding flow channels can be communicated when the shaft and the rotary feed joint shell mutually rotate, and different flow channels can be mutually independent without interference.
5. The porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting according to claim 1, characterized in that: the nitrogen nozzle (13) is provided with an auxiliary nozzle at the front end of the main nozzle, the auxiliary nozzle sprays high-pressure nitrogen with a certain angle and sprays the high-pressure nitrogen to the surface of the grinding wheel first to destroy an air barrier layer around the grinding wheel, so that an instantaneous vacuum or low-pressure area appears near the grinding area, and the low-temperature nitrogen sprayed by the main nozzle can directly contact the grinding layer.
6. The porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting according to claim 1, characterized in that: the nitrogen nozzle (13) is of a Laval nozzle structure, the front half part of the nozzle is contracted from big to small to the middle to a narrow throat, and the narrow throat is expanded from small to big outwards.
7. The porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting according to claim 1, characterized in that: the flow path curve of the grinding wheel inner flow channel (35) is determined by dividing a plurality of circles between two circles with different diameters, taking the intersection point of the tangent line of each circle and the next circle as a base point, connecting each intersection point by adopting a smooth curve, and forming the curve which is the flow path curve of the grinding wheel inner flow channel.
8. The porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting according to claim 1, characterized in that: the cross-sectional area of the grinding wheel inner runner (35) is gradually reduced along the flowing direction of the mixed liquid, and the cross-sectional area at the inlet of the inner runner is not less than two times of the cross-sectional area at the outlet of the inner runner;
9. the porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting according to claim 1, characterized in that: the one-way pipeline (18) is provided with a one-way valve at each node, and the conduction direction is one-way conduction from the liquid gallium micron particle storage tank (1) and the absolute ethyl alcohol storage tank (17) to the rotary liquid supply connector (15).
10. The method for dressing by using the porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting of claim 1, characterized in that:
step 1, a metal particle primary feeding cylinder (6) drives a particle primary feeder (7) to suck liquid gallium microparticles (19) dispersed by chitosan in a liquid gallium microparticle storage box (1) into the particle primary feeder (7) through a one-way pipeline (18); meanwhile, the absolute ethyl alcohol primary feeding cylinder (9) drives the absolute ethyl alcohol primary feeder (10) to suck the absolute ethyl alcohol (8) in the absolute ethyl alcohol storage tank (17) into the absolute ethyl alcohol primary feeder (10) through a one-way pipeline (18) to prepare for primary mixing;
step 2, the feeding cylinder drives a particle first-level material supplementing device (7), meanwhile, the absolute ethyl alcohol first-level feeding cylinder (9) drives an ethyl alcohol material supplementing device, and liquid gallium microparticles (19) dispersed by chitosan in the particle first-level material supplementing device (7) and absolute ethyl alcohol (8) in the absolute ethyl alcohol first-level material supplementing device (10) are pushed into a first-level SL static mixer (5) to be mixed for the first time;
step 3, after the primary mixing is finished, the liquid gallium micron particle secondary feeding cylinder (3) drives the liquid gallium micron particle secondary feeder (4) to suck the liquid gallium micron particles (19) in the liquid gallium micron particle storage box into the liquid gallium micron particle secondary feeder (4) through the one-way pipeline (18) to prepare for secondary mixing;
step 4, driving a liquid gallium microparticle secondary feeding cylinder (3) to drive a liquid gallium microparticle secondary material supplementing device (4) to push liquid gallium microparticles into a secondary SL static mixer (2) to be secondarily mixed with liquid gallium microparticle absolute ethyl alcohol mixed liquid in the primary SL static mixer;
step 5, the secondary mixed liquid enters a rotary liquid supply connector (15) through a one-way pipeline (18), and then sequentially enters an annular liquid tank (30) of the rotary liquid supply connector, a rotary feeding connector shaft inlet (27), a rotary feeding connector shaft flow passage (26) and a rotary feeding connector shaft outlet (25) to enter an inner flow passage liquid storage cavity (36);
step 6, starting a spindle box motor (12), grinding a workpiece by a grinding wheel (14), allowing a mixed liquid in an inner flow channel liquid storage cavity (36) to flow to a grinding layer (33) of the grinding wheel along an inner flow channel (35) under the centrifugal action, and filling gaps between abrasive particles and bottom-most abrasive dust through air holes of the grinding layer;
step 7, starting a spindle box motor, and simultaneously spraying high-pressure low-temperature nitrogen to the grinding layer of the grinding wheel by a nitrogen nozzle (13) to freeze liquid gallium microparticles to minus sixty ℃, wherein the liquid gallium microparticles are violently deformed to prop or break the abrasive dust (23) from the surface of the abrasive particles (22);
and 8, separating the solid liquid gallium microparticles and the abrasive dust from the grinding layer of the grinding wheel under the centrifugal action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111444390.8A CN114274048A (en) | 2021-11-30 | 2021-11-30 | Porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111444390.8A CN114274048A (en) | 2021-11-30 | 2021-11-30 | Porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114274048A true CN114274048A (en) | 2022-04-05 |
Family
ID=80870595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111444390.8A Withdrawn CN114274048A (en) | 2021-11-30 | 2021-11-30 | Porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114274048A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119681806A (en) * | 2025-02-25 | 2025-03-25 | 湖南科技大学 | A light-absorbing-modified CBN grinding wheel and preparation method thereof |
-
2021
- 2021-11-30 CN CN202111444390.8A patent/CN114274048A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119681806A (en) * | 2025-02-25 | 2025-03-25 | 湖南科技大学 | A light-absorbing-modified CBN grinding wheel and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103231310B (en) | Cryogenic cooling and nano particle jet flow minimal quantity lubrication coupling grinding medium supply system | |
| CN113103070B (en) | A method for machining microgrooves by shear-thickening abrasive flow compound grinding | |
| CN114734365B (en) | Surface finishing method of fine inner flow channel, fine inner flow channel workpiece and finishing medium | |
| WO2023005474A1 (en) | Low temperature air flow servo auxiliary sand removal apparatus and method for frozen sand mold cutting | |
| JP2008264926A (en) | Deburring washing device and deburring washing method | |
| EP0110529A2 (en) | High velocity fluid abrasive jet | |
| CN105108632A (en) | Inner cylindrical face airflow-assisted abrasive flow polishing machining device | |
| CN114274048A (en) | Porous ceramic grinding wheel dressing device based on liquid gallium freezing micro-blasting | |
| CN102225535A (en) | Quasi-rectangular abrasive nozzles for abrasive waterjet | |
| CN112008609A (en) | Core-shell abrasive jet polishing method | |
| CN104625267B (en) | Electrolytic-mechanical micro-cutting processing method of wire saw wound electrode | |
| CN113001415B (en) | Method for deburring and polishing precision parts by using low-pressure spray | |
| CN203236358U (en) | Cryogenic cooling and nano particle jet flow minimal quantity lubrication coupling grinding medium supply system | |
| EP0546117A1 (en) | Method and apparatus of machining with improved chip control | |
| CN115709439A (en) | Nano multiphase jet flow composite polishing device and method for additive manufacturing of inner wall of channel heat pipe | |
| CN119466590A (en) | A plasma drill bit with a cluster impact nozzle and a drilling method | |
| CN202192552U (en) | Quasi-rectangular abrasive nozzle for abrasive water jet | |
| CN101708596A (en) | Method for removing inner pore burrs of micropores by water-jet technology | |
| RU2491155C2 (en) | Method of surface hardening of part inner surfaces | |
| CN108855662B (en) | Porous direct-rotating mixed cavitation jet nozzle | |
| CN110977788A (en) | Tool and method for removing burrs of aero-engine oil nozzle by abrasive flow process | |
| CN102430982B (en) | Method and device for auxiliary injection of grinding fluid into grinding wheel airflow field | |
| CN116512132A (en) | Method for removing burrs of 3D printing collimator by using liquid sand blasting | |
| CN214351758U (en) | A pulsed water jet polishing device based on premixed abrasives | |
| CN104070461A (en) | Grinding material water jet cutting nozzle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220405 |
|
| WW01 | Invention patent application withdrawn after publication |